How can you send a database, or give access to it, while making sure that different people can only see data that they are supposed to? Think of a spreadsheet. What if person A is only supposed to be able to see Rows A, C, and E, while person B is supposed to see rows A, B, and F. That's hard to make happen in modern databases. Here you'll hear the latest thinking from PARC, famous R&D lab, about how it will solve that problem. Interesting discussion about privacy in this "post Snowden" world, too. This is the last of a five-part tour through PARC, the famous R&D lab in Silicon Valley.